Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 3 Feb 2020 12:44:18 -0500
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Roman Gushchin <guro@fb.com>
Cc:     linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@kernel.org>,
        Shakeel Butt <shakeelb@google.com>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        linux-kernel@vger.kernel.org, kernel-team@fb.com,
        Bharata B Rao <bharata@linux.ibm.com>,
        Yafang Shao <laoar.shao@gmail.com>
Subject: Re: [PATCH v2 11/28] mm: slub: implement SLUB version of
 obj_to_index()
Message-ID: <20200203174418.GE1697@cmpxchg.org>
References: <20200127173453.2089565-1-guro@fb.com>
 <20200127173453.2089565-12-guro@fb.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200127173453.2089565-12-guro@fb.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Jan 27, 2020 at 09:34:36AM -0800, Roman Gushchin wrote:
> This commit implements SLUB version of the obj_to_index() function,
> which will be required to calculate the offset of obj_cgroup in the
> obj_cgroups vector to store/obtain the objcg ownership data.
> 
> To make it faster, let's repeat the SLAB's trick introduced by
> commit 6a2d7a955d8d ("[PATCH] SLAB: use a multiply instead of a
> divide in obj_to_index()") and avoid an expensive division.
> 
> Signed-off-by: Roman Gushchin <guro@fb.com>
> Acked-by: Christoph Lameter <cl@linux.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>